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Lifetime, Critical Nucleus Size, and...

German, Sean R.

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Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles./
作者:	German, Sean R.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	123 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
Contained By:	Dissertation Abstracts International79-04B(E).
標題:	Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10607877
ISBN:	9780355390759

Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles.
German, Sean R.

Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 123 p.

Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.

Thesis (Ph.D.)--The University of Utah, 2017.

This dissertation presents experimental and computational studies of individual nanobubbles electrochemically generated at platinum nanoelectrodes. Chapter 1 provides an overview of the physics governing bubble dynamics and a brief summary of the literature regarding nanobubbles.

ISBN: 9780355390759Subjects--Topical Terms:

516420
Chemistry.

Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles.
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245 1 0 $a Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 123 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
500 $a Adviser: Henry S. White.
502 $a Thesis (Ph.D.)--The University of Utah, 2017.
520 $a This dissertation presents experimental and computational studies of individual nanobubbles electrochemically generated at platinum nanoelectrodes. Chapter 1 provides an overview of the physics governing bubble dynamics and a brief summary of the literature regarding nanobubbles.
520 $a Chapter 2 describes a fast scan voltammetric method for measurement of nanobubble dissolution rates. After a nanobubble is nucleated from gas generated via an electrode reaction, the electrode potential is rapidly stepped to a value where the bubble is unstable and begins to dissolve. The electrode potential is immediately scanned back to values where the bubble was initially stable. Depending on the rate of this second voltammetric scan, the initial bubble may or may not have time to dissolve. The fastest scan rate at which the bubble dissolves is used to determine the bubble's lifetime. The results indicate that dissolution of a H2 or N2 nanobubble is, in part, limited by the transfer of molecules across the gas/water interface.
520 $a Chapter 3 presents electrochemical measurements of the dissolved gas concentration, at the instant prior to nucleation of a nanobubble of H 2, N2, or O2 at a Pt nanodisk electrode. The results are analyzed using classical thermodynamic relationships to provide an estimate of the size of the critical gas nucleus that grows into a stable bubble. This critical nucleus size is independent of the radius of the Pt nanodisk employed and weakly dependent on the nature of the gas.
520 $a Chapter 4 reports electrochemical measurements of Laplace pressures within single H2 bubbles between 7 and 200 nm radius (corresponding, respectively, to between 200 and 7 atmospheres). The current, associated with H2 gas generation, supporting a steady-state nanobubble is modulated by application of external pressure. The slope of the current-pressure response allows extrapolation of the bubble's curvature-dependent internal pressure. The results demonstrate a linear relationship between a bubble's Laplace pressure and its reciprocal radius, verifying the classical thermodynamic description of H2 nanobubbles as small as ~10 nm.
520 $a Chapter 5 summarizes these results and places them in the context of current research. Future directions for further studies are suggested.
590 $a School code: 0240.
650 4 $a Chemistry. $3 516420
650 4 $a Analytical chemistry. $3 3168300
650 4 $a Nanoscience. $3 587832
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710 2 $a The University of Utah. $b Chemistry. $3 2103671
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793 $a English
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